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Working memory capacity compensates for hearing related phonological processing deficit
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
2013 (English)In: Journal of Communication Disorders, ISSN 0021-9924, E-ISSN 1873-7994, Vol. 46, no 1, 17-29 p.Article in journal (Refereed) Published
Abstract [en]

Acquired hearing impairment is associated with gradually declining phonological representations. According to the Ease of Language Understanding (ELU) model, poorly defined representations lead to mismatch in phonologically challenging tasks. To resolve the mismatch, reliance on working memory capacity (WMC) increases. This study investigated whether WMC modulated performance in a phonological task in individuals with hearing impairment. A visual rhyme judgment task with congruous or incongruous orthography, followed by an incidental episodic recognition memory task, was used. In participants with hearing impairment, WMC modulated both rhyme judgment performance and recognition memory in the orthographically similar non-rhyming condition; those with high WMC performed exceptionally well in the judgment task, but later recognized few of the words. For participants with hearing impairment and low WMC the pattern was reversed; they performed poorly in the judgment task but later recognized a surprisingly large proportion of the words. Results indicate that good WMC can compensate for the negative impact of auditory deprivation on phonological processing abilities by allowing for efficient use of phonological processing skills. They also suggest that individuals with hearing impairment and low WMC may use a non-phonological approach to written words, which can have the beneficial side effect of improving memory encoding. less thanbrgreater than less thanbrgreater thanLearning outcomes: Readers will be able to: (1) describe cognitive processes involved in rhyme judgment, (2) explain how acquired hearing impairment affects phonological processing and (3) discuss how reading strategies at encoding impact memory performance.

Place, publisher, year, edition, pages
ELSEVIER , 2013. Vol. 46, no 1, 17-29 p.
Keyword [en]
Hearing impairment, Phonology, Working memory capacity, Episodic recognition
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:liu:diva-74276DOI: 10.1016/j.jcomdis.2012.10.001ISI: 000314140200002OAI: oai:DiVA.org:liu-74276DiVA: diva2:482140
Available from: 2012-01-23 Created: 2012-01-23 Last updated: 2017-12-08
In thesis
1. Representing sounds and spellings: Phonological decline and compensatory working memory in acquired hearing impairment
Open this publication in new window or tab >>Representing sounds and spellings: Phonological decline and compensatory working memory in acquired hearing impairment
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Representationer av ljud och stavning : Försämrad fonologisk förmåga och kompensatoriskt arbetsminne vid förvärvad hörselnedsättning
Abstract [en]

This thesis examined phonological processing in adults with postlingually acquired moderate-to-severe hearing impairment (HI) and whether explicit working memory processing of phonology and individual working memory capacity (WMC) can compensate for degraded phonological representations in this group (papers I-III). A second aim was to provide reference data for a test of WMC, the reading span test, and to examine the relation between reading span test performance and speech recognition in noise in a larger sample of 50-89 year olds with HI (paper IV). Non-auditory tasks of phonological processing, episodic long-term memory and WMC were used in papers I-III, and both behavioral and electrophysiological measures were collected. Results showed that phonological processing was impaired in the group with HI but that WMC and explicit working memory processing of phonology could be employed to compensate for degraded phonological representations. However, this compensation may come at the cost of interfering with episodic memory encoding. An  electrophysiological marker of HI in text-based rhyme judgments was found. Paper IV presented reference data for reading span test performance in two versions of the test in individuals with HI, and results suggesting that WMC may be differentially predictive of speech recognition in noise in different age groups of older adults with HI. The clinical implications of the present results concerns the double disadvantage of individuals with lower WMC and HI. A structured assessment of WMC in rehabilitative settings would help to identify these individuals and tailor treatment to their needs. The reading span test is suggested as a suitable future candidate for clinical WMC assessment.

Abstract [sv]

I denna avhandling undersöktes fonologiska processer hos personer med postlingualt förvärvad, måttlig till mycket grav hörselnedsättning (HNS) och om inkoppling av explicit bearbetning av fonologi eller individuell arbetsminneskapacitet kan kompensera för försämrade ljudminnen i denna grupp (studie I-III). Ett andra syfte var att sammanställa referensdata för ett test av arbetsminneskapacitet, lässpann, och undersöka relationen mellan prestation på lässpann ochigenkänning av tal-i-brus i en större grupp av 50-89 åriga personer  med HNS (studie IV). Icke-auditiva test av fonologisk förmåga, episodiskt långtidsminne och arbetsminneskapacitet användes i studie I-III och både beteendedata och elektrofysiologiska data samlades in. Resultaten visade på försämrad fonologisk förmåga i gruppen med HNS men också att explicit bearbetning av fonologi och arbetsminneskapacitet kunde användas för att kompensera för försämrade fonologiska representationer i denna grupp. Denna kompensation kan dock ske på bekostnad av att inkodning i episodiska långtidsminnet störs. Vidare identifierades en elektrofysiologisk markör för HNS i en textbaserad rimuppgift. I studie IV presenterades referensdata i två versioner av lässpanntestet för personer med mild till mycket grav HN och resultat som pekar mot möjliga skillnader mellan olika åldersgrupper i hur väl arbetsminneskapacitet predicerar igenkänning av tal-i-brus. Kliniska implikationer rör den dubbla belastning det innebär att ha både en HN och relativt sänkt arbetsminneskapacitet. En strukturerad bedömning av arbetsminneskapacitet i samband med rehabilitering skulle kunna bidra till att synliggöra dessa personer och anpassa insatser efter deras behov. Lässpanntestet är ett test som i framtiden skulle kunna vara användbart i det sammanhanget.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 57 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 591Studies from the Swedish Institute for Disability Research, ISSN 1650-1128 ; 54
Keyword
Acquired hearing impairment, phonology, WMC, reading span, Förvärvad hörselnedsättning, fonologi, arbetsminne, lässpann
National Category
Medical and Health Sciences Social Sciences
Identifiers
urn:nbn:se:liu:diva-99786 (URN)10.3384/diss.diva-99786 (DOI)978-91-7519-500-1 (ISBN)
Public defence
2013-11-08, I:101, Hus I, Campus Valla, Linköpings universitet, Linköping, 13:00 (English)
Opponent
Supervisors
Available from: 2013-10-21 Created: 2013-10-21 Last updated: 2013-10-30Bibliographically approved

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Classon, ElisabetRudner, MaryRönnberg, Jerker

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